THE DETERMINATION OF CHLORIDE DIFFUSION RATE BY USING STEADY STATE MIGRATION TEST ON LOADED AND FLY ASH BLENDED CONCRETE

• Main Author: Pramayuda, Kemal
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/53967
• Institution: Institut Teknologi Bandung

The purpose of this research is to study the effect of addition of fly ash material to the concrete mixture on chloride concentration and chloride diffusion rate. The test will be carried out on 16 types of concrete. Eight types of concrete will be tested after 7 days and 8 types of concrete will be tested after 14 days. The concrete mixtures consist of 0%, 20%, 30% and 40% fly ash addition respectively that replace the cement content. The concrete cylinders will be cut into 50 mm thick concrete discs. The chloride diffusion rate will be calculated based on the Nernst- Planck equation and tested by steady state migration test based on the NT BUILD 355 standard. The results showed that the fly ash addition increase the chloride resistance, therefore reducing the chloride diffusion rate. Based on the results from 7 days testing, the decrease in chloride concentration for unloaded fly ash blended concrete is 61.3% while in loaded concrete is 79.8%. The results from the 14 days testing show that the higher the fly ash content in the concrete mixture, the smaller the chloride concentration found in concrete. The final results also show that the highest chloride diffusion rate is obtained from the concrete without fly ash addition. The chloride diffusion rate for concrete with 40% fly ash content is found decrease with increasing time.